<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button @click="loginOut" type="info">退出</el-button>
    </el-header>
    <!-- 页面主题区域 -->
    <el-container>
      <!-- 侧边栏区域 -->
      <el-aside :width="isCollapse ? '64px':'200px'" >
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          :unique-opened='true'
          :collapse="isCollapse"
          :collapse-transition="false"
          :router='true'
          :default-active="activePath"
          
        >
        <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
              <el-menu-item :index="subItem.path" v-for="subItem in item.children" :key="subItem.id"
              @click="saveNavState(subItem.path)" 
              >
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
        <router-view>111</router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        '125': "iconfont icon-user ",
        '103': "iconfont icon-tijikongjian",
        '101': "iconfont icon-shangpin",
        '102': "iconfont icon-danju",
        '145': "iconfont icon-baobiao"
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath:''
    }
  },
  created(){
    this.getMenuList();
    // 当刷新数据的时候，将存贮的链接赋值给activePath让其高亮
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    loginOut() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus');
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data;
      console.log(res);
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath',activePath);
      this.activePath = activePath;
    }
  },

}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #373d44;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.el-menu {

}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  background-color: #4A5064;
  color: #fff;
  letter-spacing: 4px;
  cursor: pointer;
}
</style>